Abstract
Peptide antibiotics are typically biosynthesized by one of two distinct machineries in a ribosome-dependent or ribosome-independent manner. Pheganomycin (PGM (1)) and related analogs consist of the nonproteinogenic amino acid (S)-2-(3,5-dihydroxy-4-hydroxymethyl)phenyl-2-guanidinoacetic acid (2) and a proteinogenic core peptide, making their origin uncertain. We report the identification of the biosynthetic gene cluster from Streptomyces cirratus responsible for PGM production. Unexpectedly, the cluster contains a gene encoding multiple precursor peptides along with several genes plausibly encoding enzymes for the synthesis of amino acid 2. We identified PGM1, which has an ATP-grasp domain, as potentially capable of linking the precursor peptides with 2, and validate this hypothesis using deletion mutants and in vitro reconstitution. We document PGM1's substrate permissivity, which could be rationalized by a large binding pocket as confirmed via structural and mutagenesis experiments. This is to our knowledge the first example of cooperative peptide synthesis achieved by ribosomes and peptide ligases using a peptide nucleophile.
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Acknowledgements
This study was supported by a Grant-in-Aid for Scientific Research (23108101 and 25560397 to T.D. and 25108710 to H.M.) from the Japan Society for the Promotion of Science. We thank M. Igarashi from the Institute of Microbial Chemistry and S. Taguchi from Hokkaido University for providing us with S. cirratus and apidaecin, respectively.
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M.N., H.M. and T.D. designed the research. M.N., T.M. and K.O. performed in vitro experiments. T.M., S.O. and H.M. carried out crystallography. I.S. and H.I. synthesized substrates and performed NMR studies. M.N., Y.H., C.M. and Y.S. analyzed products by LC/MS. J.I. and T.D. identified the gene cluster. M.N., H.M. and T.D. analyzed data and wrote the manuscript.
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Noike, M., Matsui, T., Ooya, K. et al. A peptide ligase and the ribosome cooperate to synthesize the peptide pheganomycin. Nat Chem Biol 11, 71–76 (2015). https://doi.org/10.1038/nchembio.1697
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DOI: https://doi.org/10.1038/nchembio.1697
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